Study of Cationic and Nonionic Mixed Micelles with NaBr and 3,5-Cl 2 C 6 H 3 CO 2 Na by Use of Probe Nucleophilic Reaction of Piperidine with Ionized Phenyl Salicylate.

Behaviors of cationic and nonionic mixed micelles in the form of hexadecyltrimethylammonium bromide (HDABr) and hexadecyltrimethylammonium bromide-Polyethylene glycol hexadecyl ether (C16 E20 ), in the presence of inert salts (NaBr and 3,5-dichlorosodium benzoate), by the use of reaction probe between Pp and ionized PhSH (Pp = piperidine and PhSH = phenyl salicylate), has been reported in this work. The values of RX Br (RX Br denotes ion exchange constants obtained in the presence of micelles of different structural features) or KX Br (KX Br denotes ion exchange constants obtained in the presence of micelles of the same structural features) for 3,5-Cl2 C6 H3 CO2 - were almost the same at three different [HDABr]T (0.006, 0.010 and 0.015 M). The average value of RX Br or KX Br determined, in the presence of pure HDABr micelles, using semi empirical kinetic (SEK) method appeared to be almost 2½-fold larger (RX Br or KX Br = 198) than that in the presence of mixed HDABr-C16 E20 micelles (RX Br or KX Br = 78). Rheological measurements indicated the existence of wormlike/twisted micelles and vesicle at 0.015 M pure HDABr, various [3,5-Cl2 C6 H3 CO2 Na], and 25 and 35℃ whereas there were evidence of only spherical micelles in the presence of mixed HDABr-C16 E20 ([HDABr]T = 0.015 M and [C16 E20 ]T = 0.006 M) at both temperatures.